The space shuttle Endeavour is seen on launch pad 39a after the rollback of the Rotating Service Structure (RSS), Sunday, May 15, 2011, at Kennedy Space Center in Cape Canaveral, Fla. During the mission, Endeavour and the STS-134 crew will deliver the Alpha Magnetic Spectrometer (AMS) and spare parts including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. Launch is targeted for Monday, May 16 at 8:56 a.m. EDT. Photo credit: (NASA/Bill Ingalls)

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